<template>
    <div class="com-container">
        <div class="com-chart" ref="stock_ref">
        </div>
    </div>
</template>
    
<script>
import { mapState } from 'vuex'
export default {
    data() {
        return {
            chartInstance: null,
            allData: null,
            currentIndex: 0, // 当前显示的数据
            timerId: null // 定时器的标识
        }
    },
    created() {
        this.$socket.registerCallBack('stockData', this.getData)
    },
    mounted() {
        this.initChart()
        // this.getData()
        this.$socket.send({
            action: 'getData',
            socketType: 'stockData',
            chartName: 'stock',
            value: '',
        })
        window.addEventListener('resize', this.screenAdapter)
        this.screenAdapter()
    },
    destroyed() {
        window.removeEventListener('resize', this.screenAdapter)
        this.$socket.unRegisterCallBack('stockData')
        clearInterval(timerId)
    },
    methods: {
        initChart() {
            this.chartInstance = this.$echarts.init(this.$refs.stock_ref, 'chalk')
            const initOption = {
                title: {
                    text: '▎库存和销量分析',
                    left: 20,
                    top: 20
                }
            }
            this.chartInstance.setOption(initOption)
            this.chartInstance.on('mouseover', () => {
                clearInterval(this.timerId)
            })
            this.chartInstance.on('mouseout', () => {
                this.startInterval()
            })
        },
        getData(ret) {
            // const { data: ret } = await this.$http.get('stock')
            this.allData = ret
            this.updateChart()
        },
        updateChart() {
            const centerArr = [
                ['18%', '40%'],
                ['50%', '40%'],
                ['82%', '40%'],
                ['34%', '75%'],
                ['66%', '75%']
            ]
            const colorArr = [
                ['#4FF778', '#0BA82C'],
                ['#E5DD45', '#E8B11C'],
                ['#E8821C', '#E55445'],
                ['#5052EE', '#AB6EE5'],
                ['#23E5E5', '#2E72BF']
            ]
            const start = this.currentIndex * 5
            const end = (this.currentIndex + 1) * 5
            const showData = this.allData.slice(start, end)
            const seriesArr = showData.map((item, index) => {
                return {
                    type: 'pie',
                    center: centerArr[index],
                    hoverAnimation: false, // 关闭鼠标移入到饼图时的动画效果
                    labelLine: {
                        show: false // 隐藏指示线
                    },
                    label: {
                        position: 'center',
                        color: colorArr[index][0]
                    },
                    data: [
                        {
                            name: item.name + '\n\n' + item.sales,
                            value: item.sales,
                            itemStyle: {
                                color: new this.$echarts.graphic.LinearGradient(0, 1, 0, 0, [
                                    {
                                        offset: 0,
                                        color: colorArr[index][0]
                                    },
                                    {
                                        offset: 1,
                                        color: colorArr[index][1]
                                    }
                                ])
                            }
                        },
                        {
                            value: item.stock,
                            itemStyle: {
                                color: '#333843'
                            }
                        }
                    ]
                }
            })
            const dataOption = {
                series: seriesArr
            }
            this.chartInstance.setOption(dataOption)
        },
        screenAdapter() {
            const titleFontSize = this.$refs.stock_ref.offsetWidth / 100 * 3.6
            const innerRadius = titleFontSize * 2.8
            const outterRadius = innerRadius * 1.125
            const adapterOption = {
                title: {
                    textStyle: {
                        fontSize: titleFontSize
                    }
                },
                series: [
                    {
                        type: 'pie',
                        radius: [outterRadius, innerRadius],
                        label: {
                            fontSize: titleFontSize / 2
                        }
                    },
                    {
                        type: 'pie',
                        radius: [outterRadius, innerRadius],
                        label: {
                            fontSize: titleFontSize / 2
                        }
                    },
                    {
                        type: 'pie',
                        radius: [outterRadius, innerRadius],
                        label: {
                            fontSize: titleFontSize / 2
                        }
                    },
                    {
                        type: 'pie',
                        radius: [outterRadius, innerRadius],
                        label: {
                            fontSize: titleFontSize / 2
                        }
                    },
                    {
                        type: 'pie',
                        radius: [outterRadius, innerRadius],
                        label: {
                            fontSize: titleFontSize / 2
                        }
                    }
                ]
            }
            this.chartInstance.setOption(adapterOption)
            this.chartInstance.resize()
        },
        startInterval() {
            if (this.timerId) {
                clearInterval(this.timerId)
            }
            this.timerId = setInterval(() => {
                this.currentIndex++
                if (this.currentIndex > 1) {
                    this.currentIndex = 0
                }
                this.updateChart() // 在更改完currentIndex之后 , 需要更新界面
            }, 3000)
        }
    },
    computed:{
        ...mapState(['theme'])
    },
    watch:{
        theme(){
            this.chartInstance.dispose()//销毁当前图标
            this.initChart()
            this.screenAdapt()
            this.updateChart()//更新图表数据 屏幕适配
        }
    }
}
</script>
    
<style lang="scss" scoped></style>